Solid-state NMR study of pedal motion in crystals

变温x射线衍射研究已经揭示了许多有机分子，如偶氮苯和苯乙烯，在晶体中经历踏板运动。在本研究中，我们使用固态核磁共振波谱检查了踏板运动。在某些情况下，我们已经成功地通过踏板运动确定了构象相互转换的速率。根据该过程速率对温度的依赖性，估计了踏板运动的激活能。

Variable-temperature X-ray diffraction study had already revealed that many organic molecules, such as azobenzenes and stilbenes, undergo pedal motion in crystals. In the present study we have examined the pedal motion by using solid-state NMR spectroscopy. In some cases, we have succeeded in determining the rates of conformational interconversion through the pedal motion. The activation energy of the pedal motion was estimated from the temperature dependence of the rate of the process.